2SA1859A Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -180 V
• Collector-Base Voltage, max: -180 V
• Emitter-Base Voltage, max: -6 V
• Collector Current − Continuous, max: -2 A
• Collector Dissipation: 20 W
• DC Current Gain (h_fe): 60 to 240
• Transition Frequency, min: 60 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220F

Here is an image showing the pin diagram of this transistor.Sometimes the "2S" prefix is not marked on the package - the 2SA1859A might only be marked "A1859A".The complementary NPN transistor to the 2SA1859A is the 2SC4883A.You can replace the 2SA1859A with the 2SA1668, 2SB940A, MJE15033, MJE15033G, MJE5850, MJE5850G, MJE5851 or MJE5851G.